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(11)

EP 2 697 479 A1

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(43) Date of publication: 19.02.2014 Bulletin 2014/08 (21) Application number: 11863609.1 (22) Date of filing: 21.12.2011

(51) International Patent Classification (IPC):  E21B 34/08(2006.01) E21B 34/16(2006.01) E21B 34/14(2006.01) (86) International application number: PCT/US2011/066514 (87) International publication number: WO 2012/141753 (18.10.2012 Gazette 2012/42)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR (30) Priority: 12.04.2011 US 201113085075 (71) Applicant: Halliburton Energy Services, Inc. Houston, TX 77072 (US)	(72) Inventors: WILLIAMSON, Jimmie, R., Jr. Carrollton, TX 75006 (US) SCOTT, Bruce, E. Carrollton, TX 75006 (US) (74) Representative: HOFFMANN EITLE  Patent- und Rechtsanwälte Arabellastrasse 4 81925 München 81925 München (DE)